以青贮玉米龙辐单208、东青1号、吉饲8号和中原单32为材料，研究了不同收割期对青贮玉米鲜草产量和干物质产量的影响。试验结果表明，青贮玉米整株鲜草产量在授粉后20-30天较高，干物质产量随着收获期的延迟而不断增加。北方寒地青贮玉米适宜收获期为授粉后40-50天。

Based on the research of silage maize Longfudan208, Dongqing1, Jisi8hao and Zhongyuandan32, this article studies the influence of different harvest date on the yield of Fresh matter and dry matter. Results of the research show that:Fresh matter reach the most 20-30 days after pollination and dry matter increases as harvest date delayed.From analysis of dry matter accumulation, the best harvest date northern cold areas is 40-50days after pollination.